use -source 7 or higher

Question

While trying to build a project using intelliJ Ultimate 12 I am getting these errors

use -source or higher to enable diamond operator
use -source 7 or higher         


        

Answer 1

For me, it's because the maven-compiler-plugin's source and target is set to 1.6 rather than 1.7 in pom.xml, changing it to 1.7 solved the problem.

    maven-compiler-plugin
    3.0
    
        1.7
        1.7